/* 侧边栏深色 */
.sidebar {
  min-height: 100vh;
  background: #343a40;
}
.sidebar .nav-link {
  color: #ced4da;
}
.sidebar .nav-link.active,
.sidebar .nav-link:hover {
  color: #fff;
  background: #495057;
}
/* 主内容区 */
.main {
  padding: 1.5rem;
}